<!DOCTYPE html>
<html lang="en">
<head>
  <meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
  <meta content="no-cache" http-equiv="Cache-Control" />
  <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=0">
  <meta content="yes" name="apple-mobile-web-app-capable" />
  <meta content="telephone=no" name="format-detection" />
  <title>使用帮助</title>
  <link rel="stylesheet" href="../css/style.css">
  <style>
    .help {
      width: 100%;
      height: 100%;
      font-size: x-large;
      display: flex;
      align-items: center;
      justify-content: center;
    }
  </style>
</head>
<body>
<div class="main" id="main">
  <div class="help">使用帮助</div>
</div>
</body>
</html>